using System;
using System.Collections.Generic;
using System.Linq;
using static System.Console;

class Program
{
    static void Main()
    {
        ReadLine();
        var A = ReadLine().Split().Select(int.Parse).ToArray();
        Array.Sort(A);
        var a = 0;
        for (int i = 0; i < A.Length; i++)
        {
            a += Math.Abs(A[i] - i - 1);
        }
        WriteLine(a);
    }
}